 <style>
  *{margin:0 auto;padding:0 auto;}
  .f{
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    z-index: -9999;
    -webkit-transform: translateX(-50%) translateY(-50%);
    transform: translateX(-50%) translateY(-50%);
    -webkit-transition: 1s opacity;
    transition: 1s opacity;
	background-color:skyblue;
	

  }
   .v{
     position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -10000; 
	background-color:skyblue;

  

   }
  .v:before{
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    display: block;
    z-index: -1000;
    top: 0;
    left: 0;
    background: rgba(90,20,10,.2);
   
   
   } 
  </style>
